docs: def forum_list(context, forum_visibility_contents):
      """ Renders the considered forum list.
  
      This will render the given list of forums by respecting the order and the depth of each
      forum in the forums tree.
  
      Usage::
  
          {% forum_list my_forums %}
  
      """
      request = context.get('request')
      tracking_handler = TrackingHandler(request=request)
  
      data_dict = {
          'forum_contents': forum_visibility_contents,
          'unread_forums': tracking_handler.get_unread_forums_from_list(
              request.user, forum_visibility_contents.forums),
          'user': request.user,
          'request': request,
      }
  
      root_level = forum_visibility_contents.root_level
      if root_level is not None:
          data_dict['root_level'] = root_level
          data_dict['root_level_middle'] = root_level + 1
          data_dict['root_level_sub'] = root_level + 2
  
      return data_dict